Made a torus knot from a line and an attrib vop. I was able to make a few different types after I figured out the basics from wikipedia, and a few other sites around the web (it’s actually quite simple)

Just messing around some more. Used instanced lights (wanted to figure it out anyway) to get the illumination near the tips… but thinking I should probably just use a uv/ramp based approach in the shader  instead.